海绵城市就是能够像海绵一样吸水的城市。这样的城市，能够最大程度地留住雨水。具体来说，就是在城市小区里布置若干地块，用吸水材料建设，作为海绵体，平时是市民的休闲公园，暴雨的时候就作为蓄水的地方。无论是泥地、草地还是树林、湖泊，都能吸收大量雨水。这样，可以把水消化在本地，避免汇集到一起形成洪水。当大量的雨水都被海绵体吸收之后，城市的积水也就无从谈起。那些被海绵体充分吸收的雨水还可以再次利用，如浇花、洗车等，在一定程度上可以缓解水资源紧张局面。

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